Fig. 1

Prediction of heavy metal concentrations (a: Cr; b: Ni; c: As; d: Cu; e: Zn; f: Cd; g: Pb; h: Hg. Red represents high concentrations of heavy metals. Maps were downloaded using BIGEMAP 30.0.0.0 (http://www.bigemap.com/). kriging interpolation analysis was performed by Sufer 23.2.176 (https://www.goldensoftware.com/products/surfer/) and microbial diversity indices (i).